This paper studied the adhesive strength and electrolyte resistance of the pouch film according to the kind of the extruded resin, which is the basis of the numerous variables in extrusion lamination. After preparing a pouch film by using various extruded resins, we measured the adhesive strength and electrolyte resistance between the aluminum foil and the CPP film. The minimal difference was observed between the adhesive strength with the extruded resin. Also, the extruded resin used in the experiment did not satisfy the electrolyte resistance. An electrolyte resistance was obtained by addition of the functional resin to the extruded resin. The addition of functional resins resulted in improved adhesive strength and electrolyte resistance, that were measured to be approximately 1300 gf/15 mm and 800 gf/15 mm, respectively, at 85℃ for 7days.

In this study, the intention is the determination of the optimum laminate conditions for the improvement of the chemical resistance of the aluminum-pouch films that are widely used as a packaging material for the secondary battery. Here, the properties including the initial adhesive strength and the electrolyte resistance between the metal-film layer with aluminum and the sealant layer with cast polyprophylene (CPP) film were investigated. Regarding the lamination condition, the lamination temperature, speed, and pressure conditions were changed. A roll-to-roll dry lamination-coating system was used in the surface-treatment agent coating, adhesive coating, and film lamination. For the lamination conditions of the aluminum and CPP films, the initial adhesive strength of the laminated-pouch film manufactured with a 110oC temperature and a 6.0 M/min line speed is 1200 gf/15 mm. The measured adhesive strength of the 85oC electrolyte resistance after its immersion for 7 days is 600 gf/15 mm.